President Barack Obama's announcement that he supports gay marriage is a heartening development in the campaign for equality, and it is commendable that he made his view public before the November election rather than afterward. But he needs to do more. Gay marriage won't be the central issue in his campaign against Republican Mitt Romney — the economy remains the foremost issue for voters — but the president needs to continue speaking out about the topic nonetheless. Voters in Washington, Maine and, most likely, Maryland will be voting on the issue this fall, and the president has the opportunity to play a meaningful role in those decisions, particularly here. If the president believes allowing marriage equality is a matter of fundamental justice, it is his duty as the nation's top elected official to do what he can to advance the cause.